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Line 1: '''Attribute-based encryption''' is a type of [[public-key encryption]] in which the [[secret key]] of a user and the ciphertext are dependent upon attributes (e.g. the country in which they live, or the kind of subscription they have). In such a system, the decryption of a ciphertext is possible only if the set of attributes of the user key matches the attributes of the ciphertext.<ref>{{cite web \|title=What is Attribute-Based Encryption \|work=Cryptography Stack Exchange \|url=https://crypto.stackexchange.com/a/17894 \|date=2014 }}</ref> A crucial security aspect of attribute-based encryption is ~~collision~~collusion-resistance: An adversary that holds multiple keys should only be able to access data if at least one individual key grants access. ==History==

Attribute-based encryption: Difference between revisions